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  Description:  Keyboard Intercept      [PS/2]
 
  Invoked for each keystroke by the ROM BIOS's Int 09H keyboard
  interrupt handler.
 
  Input                   Output
  ════════════            ═════════════════════════════
  AH=4FH                  If scan code consumed
  AL=scan code            Carry flag=clear
                          If scan code not consumed
                          Carry flag=set
                          AL=unchanged or new scan code
                                    -♦-